Fix case when no section at top of input file

This fixes issue #13

src/input2.c

@@ -217,6 +217,8 @@ int  readdata()
 
       /* Otherwise process next line of input in current section */
          else
+         {
+            if (sect >=0) //for cases were no section is present on the top of the input file
             {
                 inperr = newline(sect,line);
                 if (inperr > 0)
@@ -225,6 +227,12 @@ int  readdata()
                    errsum++;
                 }
             }
+            else
+            {
+                errcode = 200;
+                break;
+            }
+         }
 
       /* Stop if reach end of file or max. error count */
          if (errsum == MAXERRS) break;